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The moon is from Cordoba, Argentina, on October 11, 2016. The moon is bombarded by so much space rock that its surface gets a complete face-lift every 81,000 years, according to a study released Wednesday based on NASA data. This churn – affecting the top two centimeters (nearly an inch) of mostly loose moon dust – happens 100 times more frequently than previously thought, scientists reported. The study also estimates that asteroids and comets crashing into Earth’s only natural satellite create, on average, 180 new craters at least 10 meters (33 feet) in diameter every year. (Photo by Juan Mabromata/AFP Photo)
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